Fait mathématique: 7225 is the number of ways to 17-color the faces of a tetrahedron.
Culture générale: 7225 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: October 12th is the day in 1986 that Elizabeth II of the United Kingdom and Prince Philip, Duke of Edinburgh visit the People's Republic of China.